The iostat can only be run as the root user
There could be zero percent I/O wait and still be an I/O bottleneck
Any I/O wait time displayed in output of iostat is an indication of severe I/O bottlenecks
Running iostat without any arguments/parameters is sufficient for resolving I/O bottlenecks
第1题：
Which of the following commands should be used to monitor disk utilization during the time a system is experiencing a disk I/O performance problem？（）
第2题：
Which of the following metrics provided by the iostat report is used to initially determine if a disk is I/O bound？（）
第3题：
A. The FRA disk group has an asynchronous I/O bottleneck
B. The least number of I/Os are performed on the last data file in the list
C. The number of times that the backup or restore process directed the OS to wait until an I/O was complete is the highest for the last data file in the list
D. The number of times that the backup or restore process made an OS call to poll for I/O completion in Nonblocking mode is the least for the FRA disk group
第4题：
Which of the following phrases is TRUE regarding monitoring disk I/O with iostat？（）
第5题：
Which iostat %iowait minimum threshold indicates a possible I/O bottleneck?（）
第6题：
In an iostat report， which of the following options best describes the value of % idle？（）
第7题：
Which of the following metrics provided by the iostat report is used to initially determine if a system is I/O bound？（）
第8题：
A. Only one I/O calibration process can run at a time.
B. It automates the resource allocation for the Automated Maintenance Tasks.
C. It improves the performance of the performance-critical sessions while running.
D. It can be used to estimate the maximum number of I/Os and maximum latency time for the system.
E. The latency time is computed only when the TIMED_STATISTICS initialization parameter is set to TRUE.
第9题：
When the length of the run queues， process or thread dispatches interrupts， and lock contention metrics and statistics are analyzed for performance， which of the following resources is being analyzed？（）
第10题：
Which of the following commands should be used to determine which disk of a system is experiencing a disk I/O performance problem？（）